Table 1.

Anatomical overview of cholinergic projections with corresponding Ch1–6 nomenclature.

System	Cholinergic cell group	Containing nuclei	Target
Basal forebrain	Ch1	Medial septum	Hippocampus
Basal forebrain	Ch2	Vertical limb of the diagonal band of Broca	Hippocampus
Basal forebrain	Ch3	Lateral part of horizontal limb of the diagonal band of Broca	Olfactory bulb
Basal forebrain	Ch4	Nucleus basalis magnocellularis (i.e., nucleus basalis of Meynert), Globus pallidus, neurons lateral to the vertical limb, and neurons in the medial part of the horizontal limb of the diagonal band of Broca	Neocortex, Basolateral amygdala
Brainstem	Ch5	Pedunculopontinus, cuneiform, parabrachial area	Thalamus, Basal ganglia
Brainstem	Ch6	Lateral tegmental nucleus	Thalamus, Basal ganglia